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High eustatic sea level during the middle Pliocene; evidence from the Southeastern U.S. Atlantic Coastal Plain; with Suppl. Data 90-13

Harry J. Dowsett and Thomas M. Cronin
High eustatic sea level during the middle Pliocene; evidence from the Southeastern U.S. Atlantic Coastal Plain; with Suppl. Data 90-13
Geology (Boulder) (May 1990) 18 (5): 435-438

Abstract

The middle Pliocene, approximately 3.5-2.5 Ma, was a period of global warmth preceding the growth of major Northern Hemisphere ice sheets. We report on eustatic sea level for the middle Pliocene based on micropaleontologic study of marine deposits of the Duplin Formation of South Carolina and North Carolina. The Duplin was deposited during a middle Pliocene marine transgression that formed the Orangeburg scarp, a prominent wave-cut geomorphic paleoshoreline of the southeastern U.S. Atlantic Coastal Plain. We conclude that (1) the scarp in South Carolina was formed mostly during the middle Pliocene (3.5-3.0 Ma), (2) eustatic sea level was about 35+ or -18 m higher than modern sea level (the scarp has been uplifted about 50-65 m since the middle Pliocene), and (3) ocean-water temperatures along eastern North America were warmer when the scarp was formed than they are at present.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 18
Serial Issue: 5
Title: High eustatic sea level during the middle Pliocene; evidence from the Southeastern U.S. Atlantic Coastal Plain; with Suppl. Data 90-13
Affiliation: U. S. Geol. Surv., Reston, VA, United States
Pages: 435-438
Published: 199005
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 31
Accession Number: 1990-035714
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, chart, sketch map
N34°01'00" - N34°19'00", W79°58'60" - W79°58'00"
N34°34'60" - N34°43'00", W78°58'60" - W78°43'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1990
Program Name: USGSOPNon-USGS publications with USGS authors
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